Question

I have two select statements that find the maximum salary for a specific role.
Now I want to have the maximum of the two returns of those select statements.
Think about the following code:

SELECT MAX(SALARY) 
  FROM TABLE1 
 WHERE ROLE = 'MANAGER'

SELECT MAX(SALARY) 
  FROM TABLE1 
 WHERE ROLE = 'DEVELOPER'; 

At the end I want the maximum of these two numbers.

How would I do all this in one query?

Have two selects for maximum, then compare those maximums and give the maximum of the two maximums?

Answer 1

Since both selects read from the same table, you can do this:

SELECT MAX(SALARY) FROM TABLE1 WHERE ROLE = 'MANAGER' OR ROLE = 'DEVELOPER'